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[Rafael David Tinoco <inaddy@xxxxxxxxxx>]

*** This bug is a duplicate of bug 1417580 ***
    https://bugs.launchpad.net/bugs/1417580

It affects E5 V2 also:

http://www.intel.com.br/content/dam/www/public/us/en/documents
/specification-updates/xeon-e5-v2-spec-update.pdf

CA156 Performance Monitoring IA32_PERF_GLOBAL_STATUS.CondChgd Bit
Not Cleared by Reset
Problem: The IA32_PERF_GLOBAL_STATUS MSR (38EH) should be cleared by reset. Due to this
erratum, CondChgd (bit 63) of the IA32_PERF_GLOBAL_STATUS MSR may not be
cleared.
Implication: When this erratum occurs, performance monitoring software may behave
unexpectedly.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the affected steppings, see the Summary Tables of Changes.

Precise 3.2 might need to cherry-pick the fix:

commit b292d7a10487aee6e74b1c18b8d95b92f40d4a4f

Checking...

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https://bugs.launchpad.net/bugs/1416414

Title:
  Trusty + Intel E5-26xx + NMI handler (perf_event_nmi_handler) took too
  long to run

Status in linux package in Ubuntu:
  In Progress

Bug description:
  It was brought to my attention the following case:

  Hardware name: HP ProLiant DL380p Gen8, BIOS P70 12/20/2013 
  Kernel: 3.13.0-34 

  Stack trace:

  2189823.168958] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 882.406 msecs 
  [2189823.168974] Kernel panic - not syncing: An NMI occurred, please see the Integrated Management Log for details. 

  [2189823.184283] CPU: 0 PID: 60396 Comm: ceph-osd Not tainted 3.13.0-34-generic #60-Ubuntu 
  [2189823.194371] Hardware name: HP ProLiant DL380p Gen8, BIOS P70 12/20/2013 
  [2189823.202794] 0007c7a1f01b74a3 ffff88081fa06dd0 ffffffff8171bd94 ffffffffa01672d8 
  [2189823.212421] ffff88081fa06e48 ffffffff81714f95 0000000000000008 ffff88081fa06e58 
  [2189823.221889] ffff88081fa06df8 ffffffff81c1c4c0 ffffc90006278072 0000000000000001 
  [2189823.231361] Call Trace: 
  [2189823.234597] <NMI> [<ffffffff8171bd94>] dump_stack+0x45/0x56 
  [2189823.241996] [<ffffffff81714f95>] panic+0xc8/0x1d7 
  [2189823.248152] [<ffffffffa01668fd>] hpwdt_pretimeout+0xdd/0xdd [hpwdt] 
  [2189823.256251] [<ffffffff8101b7e9>] ? sched_clock+0x9/0x10 
  [2189823.263054] [<ffffffff81725448>] nmi_handle.isra.3+0x88/0x180 
  [2189823.270500] [<ffffffff817256fd>] do_nmi+0x1bd/0x340 
  [2189823.276867] [<ffffffff817248b1>] end_repeat_nmi+0x1e/0x2e 
  [2189823.283888] [<ffffffff810d7bf0>] ? futex_wait_queue_me+0x140/0x140 
  [2189823.291874] [<ffffffff810d7bf0>] ? futex_wait_queue_me+0x140/0x140 
  [2189823.299966] [<ffffffff810d7bf0>] ? futex_wait_queue_me+0x140/0x140

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